參數(shù)資料
型號： TSH512CYFT
廠商： STMICROELECTRONICS
元件分類： 消費家電
英文描述： SPECIALTY CONSUMER CIRCUIT, PQFP44
封裝： 10 X 10 MM, ROHS COMPLIANT, TQFP-44
文件頁數(shù)： 14/31頁
文件大?。?/td> 1350K
代理商： TSH512CYFT
TSH512
General description
Doc ID 8120 Rev 7
21/31
5.4
ALC section: automatic level control
Both transmitters of the TSH512 include an automatic level control (ALC). When the level of
the audio signal is too high, the ALC compresses the signal in order to avoid over-
modulation of the FM VCO. In this way, the ALC reduces the distortion and maintains a
reduced transmit spectrum with very high amplitude signals.
Figure 28.
Automatic level control schematics
The ALC features a 20 dB gain and an output signal regulated to 700 mVpp in compression.
The attack time is the response time of the ALC to go from the linear amplification to the
compression region. The attack time mainly depends on the capacitor value of CALC.
A typical value of CALC is 1 F with music as the audio signal (refer to Figure 22 on
The decay time is the response time the ALC requires to recover to full gain amplifying
mode after being in compression mode. The decay time depends mainly on the RALC
resistor value. A typical value of RALC is 470 kΩ, with music as audio signal (Figure 22).
5.5
VOX description: voice operated transmit
The voice operated transmit (VOX) section reduces consumption when there is no audio
signal to transmit. When the VOX detects that no audio signal is present, it mutes the output
buffers of TX1 and TX2 and provides the logic signal VOX-MUTE to switch-off the external
LED drivers if needed.
The audio signal of TX1 is amplified with a gain dependent on the values of Rsens and Csens.
Rsens and Csens are connected to pin 7. The high-pass filtering has the following cut-off
frequency:
f
HPF
1
2
π R
sens
C
sens
()
--------------------------------------------------
=
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